Article

Time in Quantum Gravity

Claus Kiefer

in The Oxford Handbook of Philosophy of Time

Published in print April 2011 | ISBN: 9780199298204
Published online September 2011 | | DOI: http://dx.doi.org/10.1093/oxfordhb/9780199298204.003.0024

Series: Oxford Handbooks in Philosophy

Time in Quantum Gravity

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This chapter notes that quantum gravity places the concept of time on a new level. In the absence of experimental hints, mathematical and conceptual issues must be chosen as the guides in the search for such a theory. Just as reconceiving classical notions of time was key for Einstein, in his discovery of special relativity, so too many believe that time will again hold the clue for theoretical advancement, but this time with quantum gravity. The chapter details the challenge of reconciling quantum theory with relativity, concentrating especially on why time in particular causes trouble. It describes a result in canonical quantum gravity which is possibly of signal importance, namely, that fundamentally there is no time at all, and discusses the problem of time, quantization, semiclassical time, loop quantum gravity, and string theory.

Keywords: quantum theory; relativity; time concept; Einstein; quantum gravity; string theory

Article.  7180 words. 

Subjects: Philosophy ; Philosophy of Science ; Metaphysics

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